Grinding-machine for glass plates.



No.852,626. PATENTBD MAYII, 1907.

C. SGHWARZ & J. BORTZNER.

GRINDING MACHINE FOR GLASS PLATES. APPLIQATION FILED inn. 2, 1906.

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UNITED STATES PATENT @FFTQE.

CONRAD SCHWARZ AND JOHANN BORTZNER, OF FURTH, GERMANY, ASSIGNORS TO N.WIEDERER & CO, OF FURTH, GERMANY.

GRINDING-MACHINE FOR GLASS PLATES.

Specification of Letters Patent.

ratentea May '7', 1907.

Application filed March 2, 1906. Serial No. 303,850.

To all whom, it inn/y concern:

Be it known that we, CONRAD SOHWARZ and JouANN BORTZNER, residing atFurth, Bavaria, Germany, have invented certain new and usefulImprovements in or Relating to Griiiding-lvfachines for Glass Plates andwe do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference beinghad. to the accompanying drawings, and to letters of reference markedthereon, which form a part of this specification.

This invention relates to grinding machines for beveling glass plates,and especially to machines of the kind in which the glass carrier isformed into a carriage, and the glass plate is forced by a pressureroller against the grinding surface. It differs from wellknown machinesof the same kind by the special construction of the guide-carriages andby the arrangement of the pressure roll for the work by means of whichthe attendant is enabled to bring his eye at any moment into closeproximity of the face to be ground, and thus to supervise the grindingoperation in an exact manner. During this operation, the glasssupporting carriage in well known manner, is not guided exactly at aright angle to the grinding stone axis, =ut arranged at a small angle tothe same, so that a compara tively very long glass plate rests onlyagainst one side of the conical grinding surface, and therefore thefacet is ground only in one direction.

A construction according to this invention, is illustrated, by way ofexample in the accompanying drawing, in which Figure 1 shows the machinein front elevation, Fig. 2 in side elevation, and Fig. 3 in lan.

The glass supporting carriage travels with guide rollers l) on rails asecured to the ground, so that the carriage platform 0 can be arrangedalmostimmediately above the ground. The gear for driving the carriage toand fro, can be of any desired kind, for instance the driving can beeffected by connecting the car by means of a rod i to a crank. Thecarriage is laterally bounded by two yoke -shaped struts d and e, onwhich is adjustably mounted a bracket ffor carrying the glass plate g.The attendant can therefore, while remaining in front of the carriageand holding onto the struts d and e, bend with the whole upper part ofhis body over the carriage and place his eye into the immediateneighborhood of the beveled face to be ground. He can also stand on theplatform a of the glass carrying carriage and participate in itsmovements, so that he can see and follow the grinding operation in areliable and convenient manner. In order not to interfere in any waywith the advantages resulting from the special construction of thecarriage it is necessary to give a special shape to the device forpressing the edge of the glasses against the grinding stone. To that endthe pressure roller 7c is mounted on rods suitably pivoted above thegrinding stone about a hinge pin Z. The rods themselves are providedwith a second hinge m, about which is pivoted a double lever a carryingthe roller 75, the said lever, owing to the action of a weight 0pressing the roller 7c against the glass plate. The arm 19 of the rod,on which are adjustably mounted the remaining rods, is balanced by aweight 7. Owing to this arrangement the roller 7: can be easily andquickly lifted off from the glass plate by rotating the lever a, whileat the proper throwing out of gear of the roller 76, the Whole of therods are raised upward by turning about the hinge Z. The adjustment ofthe rollers 75 can therefore be effected by the attendant while he iswatching the grindmg operation, without it being necessary for him toleave his place or the carriage.

Having now particularly described and ascertained the nature of the saidinvention, as communicated to me by my foreign correspondent, and inwhat manner the same is to be performed, I declare that what I claim1s 1. A grinding machine for glass comprising in combination, arotatable grinder, a carriage provided with a base portion havingsupporting rolls or wheels, rails or tracks for said wheels, twoinverted U-shaped uprights for said base portion of the carriage, abracket adjustably mounted on said uprights and adapted to support thematerial to be ground, a fixed arm, a support pivotally mounted theretoto swing in a vertical plane, a weighted cord secured to the outer endof said support, a pulley about which said cord is trained, a rod adjustably mounted on said support, and a bell crank retaining arm orlever pivotally mounted to said rod to swing end of said support, apulley about which said cord is trained, a rod adjustably mounted onsaid support, and a bell crank retaining arm or lever pivotally mounted,to said rod to swing in a vertical plane, a roller for one end of saidlever adapted to hold the work against the grinder, and adjustableweights for the other end of said lever.

3. A grinding machine for glass or the like comprising in combination, agrinder, a movably mounted carriage provided with uprights, a bracketadjustably mounted on said uprights, and adapted to support the materialto be ground, a fixed arm, a support pivotally mounted thereto to swingin a vertical plane, means for holding the su )port in its adjustedpositions, a rod adjusta 1y mounted on said support, a retaining leverpivotally mounted on said rod to swing in a vertical plane, and a rollerfor said lever serving to engage the work and hold the same in operativerelation to the grinder.

l. A grinding machine for glass or the like comprising in combination, agrinder, a movably mounted carriage for supporting the material to beground, a fixed arm, a support pivotally mounted thereto to swing in avertical plane, means holding the support in its adjusted positions, arod adjustably mounted on. said support, a retaining lever pivotallymounted on said rod to swing in a vertical plane, and a roller for saidlever serving to engage the work and hold the same in operative relationto the grinder.

5. A grinding machine for glass or the like comprising in combination, agrinder, a support for the work, a pivotally mounted support adapted toswing in a vertical plane, means holding the support in its adjustedpositions, a retaining lever pivotally mounted on said support andadapted to swing in a vertical plane, and a roller for said leverserving to hold the work in operative relation to the grinder.

6. A grinding machine for glass or the like comprising in combination, agrinder, a support for the work, a retaining member for holding the workin operative relation to the grinder, and a support for said retainingmember articulated therewith, and an adjustable pivotal mounting forsaid support.

7. A grinding machine for glass'or the like comprising in combination, agrinder, means for supporting the work in operative relation to thegrinder, and means for holding the work in engagement with. the grinder,said means comprising levers articulated at two points, one of saidpoints being above the grinder and permitting said means to be thrownout of proximity to the work and grinder.

8. A grinding machine for glass or the like comprising in combination, agrinder, means for supporting the work in operative relation to thegrinder, and means comprising levers articulated at two points forholding the work in engagement with the grinder, said means alsocomprising an adjusting device whereby the levers may be adjusted withrespect to each other.

9. A grinding machine for glass or the like comprising in combination, agrinder, and a support for the work traveling abreast of the grinder,said support consisting of a carriage, U-shaped struts, and a bracketadjustably mounted on said struts.

Dated this 9 day of February 1906.

In testimony whereof we aIiiX our signatures in presence of twowitnesses.

CONRAD SCHWARZ. JOHANN BORTZNER.

l/Vitnesses HEINRIGH FIETH, HERMANN DoHLoMANN.

